Loom dobby



Sept. 27,1927. 1 643,443

c. E. BUCKLEY oom DOBBY Filed April 27, 1923 nunlununu n Patented Sept. 27, 1927.

UNITED STATES CHARLES E. BUCKLEY, OF NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OE WORCESTER, MIASSACHUSE'lTS, A CORPORATION OF MASSACHUSETTS. I t

LOOM DOBBY.

Application filed April 27, 1923. Serial No. 635,116.

This invention applies to a loom dobby and relates particularly to improved devices for starting and stopping an auxiliary pattern cylinder. Dobbies having such auxiliary pattern cylinders are used in weaving handkerchiefs and similiar articles in which a cross border or other special design is woven at repeated points in the length of the fabric.

My invention is shown as applied to a loom in which a main and an auxiliary pattern 'cylinderare mounted on a single axis and in which the main cylinder is actuated by continuously operating driving mechanism while the auxiliary pattern cylinder is operated only at intermittent periods.

It is the general object of my invention to provide improved operating connections by which the starting and stopping of the auxiliary pattern cylinder is controlled.

My invention further relates to details of construction and arrangements'and combination of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings, in which Fig. 1 is a partial side elevation of a loom dobby embodying my improvements;

Fig.2 is a sectional plan view taken along the line 2-2 in Fig. 1;

Fig. 3 is .a sectional elevation of the pattern cylinder and supporting shaft; and

Fig. 4 is a detail side elevation showing certain of the parts found in Fig. 1 but in a different position.

Referring to the drawings, I have shown parts of a dobby frame 10, one side of which provides a bearing 11 for a cylinder shaft 12. The other side of the frame provides a bearing 13 for a sleeve 14 within which the shaft 12 is freely rotatable. A main or continuously operated pattern cylinder 15 is secured to the shaft 12 in any convenient manner as by a clamping screw 16 and an auxiliary or intermittently operated pattern cylinder 17 is similarly secured to the sleeve 14 by a clamping screw 18. The shaft 12 is rotated by means of a worm gear 19 and worm 20, the latter being continuously r0.-

tated by a driving shaft 21.

Pattern chains 22 and 23 are mounted in the usual manner on the cylinders 15 and 17 and are shown herein as of the double index used with a double index chain-may be actuate'd by the driving mechanism shown and described in the Davenport and Bardsley I The worm I s preferably of the dwell type and when patent. The main cylinder 15 may, however,

be used for single indexing by making the necessary and customary changes in the pattern chain and driving connections and my invention is equally struction.

A ratchet wheel 24 is secured to the outer applicable to either conend of the sleeve 14 and a feed pawl 25 is provided for advancing the ratchet wheel,

the pawl being pivotally mounted at 26 on the usual rocking lever 27. The feed pawl 25 v is provided with a stud 28 projecting over a substantially horizontal link. 29. The link 29 is provided at one end with a slot 30 through which extends a stud 31 fixed on the free end of a lever 32 pivoted at 33 to the frame 10.

The lever 32 is-positioned for engagement by a special ball or projection 34 on the pattern chain 23 of the auxiliary pattern cylinder 17. The opposite end ofthe link 29 is pivoted at 35 to an arm 36 secured to a cross bar 37 pivotally mounted in the side mem- 1 bers of the frame 10. An arm or lever 38 is secured to the bar 37 near its opposite end and is positioned forengagement by a special projection 39 on the pattern chain 22 of the main cylinder 15. i It will be understood that the pattern chains 22 and 23 are provided with the usual pins 40 co-operating with dobby fingers 41 for the cylinder"'15 and fingers 42 for" the cylinder 17.

Having described the construction of my improved dobbymechanism, the method of operation thereof is as follow:

Under normal conditions the parts are positio-ned as shown in Fig. 4, with the auxiliary pattern cylinder 17 at rest and the projection 34 holding the lever 32 and link 29 in raised position, thus preventing engagement of the pawl. 25 with the ratchet 24.

The cylinder 15 and pattern chain 22 oper-' ate continuously until the projection 39 engages the lever 38, raising said lever and rocking the shaft 37 to lower the pivot 35 which connects the arm 36 to one end of the link 29. The link 29 is thus lowered suflicientlyso that the 25 may engage the ratchet 24 and intermittently advance the pattern chain 23. The first advance movement of the chain 23 removes the projection 34: from beneath the lever 32, allowing the left hand end of the link 29 to drop and permittingthe pawl 25 'to continue in operative engagement with the ratchet 24, even after the projection 39 is removed from suppor ing position under the arm 38 by thenext feeding movement of the pattern chain 22.

The parts are then inthe operative relation shown, in Fig. 1 and the. two cylinders continue torotate together until the projection 3i returns to operative engagement with the arin32, whenthe pawl 25 is raised out of contact with the ratchet 24 and so remains,

until the projection 39 again engages the arm 38 V i I have thus provided asimple mechanical connection bywhich the auxiliary pattern a cylinder may be periodically placed in operation and will be automatically stopped after a single run ofthe pattern chain.

My invention has been found, particularly useful inthe weaving of handkerchiefs and otherarticles in which a cross border "l re-I quentl y inserted.

Havingthus described my invention, 1

do not wislito be limitedtothe details herein ,disclosedotherwise than as set forth in theclaims but what lclaim is 1. 111 a loom dobby, a main cylinder and an auxiliary pattern cylinder rotatable about the same axis, a separate dobby pattern chain on eachroylinder, means to regularly ,ad-

'vance ithe main cylinder and chain,1 addi-, tional driv ng mechanlsm for periodically, advanc ng said auxiliary cylinder and chain,

said lever, and connections between said 1ever and said pawl through which said lever mayi-render saidpawl operative. a a

2. In a multiplier, a main cylinder and an auxiliary pattern cylinder rotatable about the same axis, a separate dobby pattern, chain on each cylinder, means toregularly advance the main cylinder and chain, additional driving mechanism for periodically advancing said auxiliary cylinder and chain, and devices controlling said additional driving mechanism, said mechanism comprising, a

ratchet and anornially] inoperative-iced pawl for said auxiliary cylinder, and said devices comprising a lever, a pattern chain on saidmain cylinder effective to move said lever, connections between said lever and said pawl through which saldlever may render said pawl operative, and means con-f trolled by said auxlliary cyllnderl effective to maintain saidpawl operative and to thereafter rendersaid pawl noperative.

the same axis, means to regularly advance the ma n cyl1nder,add1t10nal driving mechanism 'l'or periodically advancing said auxiliary cylinder, and devices controlling said additional. drlvlng mechanism, said mechaiv In a multiplier, a main cylinder and an; ary pattern cylinder, rotatable about nism comprising a ratchet and a normally .7 i

inoperative feed pawl for said auxiliary cyl-i inder; and said devices comprising alinkengaging said pawl, asupport foroneend of said link positioned by a pattern chain on said main cylinder, and a support for the otherend of said link positioned by a pat- .ternchain on said auxiliary cylinder.

4:. In a multiplier, a main cylinder, andan auxiliary patterncylinder rotatable about thesame axis, means to regularly advance the main cylinder, additional driving mechanism for periodically advancing sa1dau x1l1- ary cylinder, and devices controlling said additional driving mechanism, said mecha .nism comprising a ratchet gand ;a normally inoperative 't'eedpawl for said auxiliary cyl inder, and said devices comprising a link;

engaging said; pawl, a support for onejend of said link, a rod on which SELIdSUPPOIt 11s fixed, allover on said rod, a pattern chain on said main cylinder effective tomove said leverito render said pawl operative, a sup port for the other end of said link, and

pattern chain on'said, auxiliary cylinder el fectivetomaintain said pawl operative and to ,thereatterrender said, pawl inoperative.

In testimony whereof I afiixed my i signature.

have hereunto cmintnsn. BUCKLEY. 

